Electric heater



FIG. 1 is a perspective view of an electric heater showing our new design.

FIG. 2 is a top plan view thereof.

FIG. 3 is a front elevational view thereof.

FIG. 4 is a rear elevational view thereof.

The bottom surface of the device is substantially planar and unornamented. 

The ornamental design for an electric heater, as shown and described. 